LEDA 074886：一个引人注目的矩形星系
LEDA 074886: A remarkable rectangular-looking galaxy
摘要：
我们报告发现了一个有趣而罕见的矩形星系。矮星系LEDA 074886在距离21 Mpc处的R波段绝对星等为-17.3等。除了这个星系的奇特之处外，它还存在一个嵌入的、边缘靠近的恒星盘（范围为2 R_{e,disk} = 12弧秒= 1.2 kpc），Forbes等人报告V_rot/sigma约为1.4。我们推测，这个星系可能是两个盘状星系合并后的残留物，最初的气体被向内驱动，随后形成了内盘，而较大半径的恒星有效地经历了一个无耗散的合并事件，导致这个“翡翠切割星系”具有非常四方形的等照度线，从3到5 kpc，a_4/a = -0.05到-0.08。这个星系表明，从“湿”和“干”星系合并模拟的知识可能需要结合起来，以正确理解星系演化的各种路径，特别是与蓝色椭圆星系。
英文摘要：
We report the discovery of an interesting and rare, rectangular-shaped galaxy. At a distance of 21 Mpc, the dwarf galaxy LEDA 074886 has an absolute R-band magnitude of -17.3 mag. Adding to this galaxy's intrigue is the presence of an embedded, edge-on stellar disk (of extent 2R_{e,disk} = 12 arcsec = 1.2 kpc) for which Forbes et al. reported V_rot/sigma ~ 1.4. We speculate that this galaxy may be the remnant of two (nearly edge-one) merged disk galaxies in which the initial gas was driven inward and subsequently formed the inner disk, while the stars at larger radii effectively experienced a dissipationless merger event resulting in this `emerald cut galaxy' having very boxy isophotes with a_4/a = -0.05 to -0.08 from 3 to 5 kpc. This galaxy suggests that knowledge from simulations of both `wet' and `dry' galaxy mergers may need to be combined to properly understand the various paths that galaxy evolution can take, with a particular relevance to blue elliptical galaxies.
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